Fix more ser/deser and add tests #371

Job	Run time
mavlink-dump	1m 2s
formatting	11s
linting	1m 52s
internal-tests (ardupilotmega)	1m 13s
msrv	5m 42s
internal-tests (asluav)	1m 26s
internal-tests (matrixpilot)	1m 26s
internal-tests (minimal)	1m 11s
internal-tests (paparazzi)	1m 29s
internal-tests (python_array_test)	1m 28s
internal-tests (slugs)	1m 18s
internal-tests (standard)	1m 44s
internal-tests (test)	1m 13s
internal-tests (ualberta)	1m 46s
internal-tests (uavionix)	1m 11s
internal-tests (icarous)	1m 11s
internal-tests (common)	1m 14s
docs	1m 3s
build (macos-latest, x86_64-apple-darwin, --features ardupilotmega)	4m 45s
build (ubuntu-latest, arm-unknown-linux-musleabihf, --features ardupilotmega)	2m 23s
build (ubuntu-latest, armv7-unknown-linux-musleabihf, --features ardupilotmega)	2m 25s
build (ubuntu-latest, x86_64-unknown-linux-musl, --features ardupilotmega)	2m 17s
build (ubuntu-latest, x86_64-unknown-linux-musl, --features ardupilotmega,emit-description,emit-e...	2m 20s
build (ubuntu-latest, thumbv7m-none-eabi, --no-default-features --features embedded)	1m 23s
build (windows-latest, x86_64-pc-windows-msvc, --features ardupilotmega)	3m 33s
test-embedded-size	36s
	47m 22s

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